The Asus S400CA has a better Wi-Fi standard than most laptops that have been around for a comparable time to it. This Asus laptop has an 802.11n wi-Fi standards, whereas most ultrabooks that were launched around the same time as it have an 802.11g wi-Fi standards. This Asus notebook PC also has an 802.11b wi-Fi standards.
An 802.11n wi-Fi standards is in fact the best Wi-Fi standard across all laptops of this spec and age.
The worst Wi-Fi standard amongst similar types of portable PC is 802.11a.